Power-transmitting mechanism.



PATENTED MAY 19, 1908.

J. BTUTTLB. 'POWBR TRANSMITTING MECHANISM.

APPLIOATION IILED MAR. 22. 1907.

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PATENTED MAY 19, 1908.

J. E- TUTTLE. POWER TRANSMITTING MECHANISM.

APPLICATION FILED MAR. 22, 1907- 3 SHEETS-SHEET 2.

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PATENTED MAY 19, 1908.

J. E. TUTTLE. POWER TRANSMITTING MECHANISM.

APPLICATION FILED MAR. 22, 1907.

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' tion which will be described below.

hubs 0 0 UNITED STATES PATENT OFFICE.

JAMES E. TUTTLE, OF WATERTOWN, MASSACHUSETTS.

POWER-TRANSMITTIN G MECHANISM.

N0. 887,878. Specification of Letters Patent. Patented May 19, 1908.

Application filed March 22, 1907. Serial No. 363,973.

! one adjusting screw f The friction between the various parts of the pulley is ordinarily sufficient to keep each pulley adjusted.

I prefer that the lever E be extensible and for this purpose its center piece 6 is grooved and carries at each end an arm 6 6 the position of which in the center piece 6 is adjustable by means of the clamp screws e*. A shipper G attached to one of the arms, say 6 is ,used to change the position of the lever and hence the hubs, when it is desired to change the size of the pulleys.

The pulleys themselves as shown are con structed in the following manner: Each pulley comprises two flanges H, J. In these flanges are provided slide-ways h, j within which slides a section K of the periphery or My invention will be understood by referbearing surface of the pulley. These secence to the drawings in which is shown what tions are of such size that when all the sec appears to be the best form of its emboditions are as close to the shaft as possible they ment. will form a close and contracted periphery as Figure 1 is an elevation, and Fig. 2 a plan shown in Figs. 1 and 2 and also in Fig. 4, and of a power-transmitting mechanism embodywhen expanded, although they will separate ing my invention, Fig. 3 being a section of and form a broken periphery, they will give one of the pulleys in its expanded position, a sufficient bearing to the belt, as shown in and Fig. 4 a section of such pulley in its con Figs. 1 and 2 and in Fig. 3. The movement tracted position. Fig. 5 is a sectional detail I of these sections in and out from the shaft is of two of the clamps for holding the operatcontrolled as follows: Each hub C is grooved ing lever in place, and Fig. 6 is a section on as at K and in the groove are a series of line 66 of Fig. 3. blocks leach of which carries pivoted therein I have shown my power-transmitting one arm of the lever L. The fulcrum of each mechanism mounted upon a floor A. lever is mounted in a bearing on a bracket M B, B, are bearings supported at a suitable projecting from the flange J. This bearing height from the floor, each carrying a shaft is slotted at the end and a pin m passing D, D, in which is mounted one -of said exthrough a hole in the lever L serves as a pivot panding pulleys C, C. As these two pulleys pin for it. The ends of each pivot pin m are are identical in construction I shall describe held in place by clamp pieces m which are only one of them. Each shaft carriesa spline suitably shaped (see especially Figs. 1, 2 and c, c, and on each shaft is a hub C C by 5), to fit between the brackets M and one of means of which and the parts connected the pins m and form a finish to the pulley. thereto the size of the pulley is regulated.

Each is held in place by a screw m which The two hubs C C are connected bymeans of passes through a web m connecting all the a lever E carrying at each end a yoke having brackets. pins e which fit into a groove C in the ad- The long arm of the lever L is connected to jacent hub 0 The lever E is fulcrumed in a its section K by means of a link l For this block f running in a slide f mounted on the pur ose the section is provided with side post F supported on the floor A. An adjust- I Wal s 76 which project rearward from the face To all whom it may concern:

Be it known that I, JAMES E. TUTTLE, of Watertown, in the county of Middlesex and State of Massachusetts, a citizen of the j United States, have invented a new and useful Improvement in Power-Transmitting j Mechanism, of which the following is a specij fication.

My invention is intended for use in con nection with ower shafts in order that the speed taken f fom such shaft may be regulated, according to the requirements of the work to be done, by such means that the belt, transmitting power, shall always be maintained at the same tension.

It consists in certain details of construcmg screw f binds against the block f furlc of the section and approach near their rear nishing an adjustable back support therefor. edge to form jaws between which one end of As in pulleys of this class the tendency of the the link is pivoted by the pin 70 The other is always to move in such direcend of the link is forked and between its tion as to allow the collapse of the pulley prongs the end of the lever L is pivoted by owing to the stress of the belt upon it, the the pin k tendency of this block will always be to move Each of the pulleys shown in the drawings in the direction of the arrow (see Fig. 2), and has twelve sections and a corresponding hence its position may be regulatedby the number of levers L, all the levers of the one pulley being operated by its hub C In Figs.

3 and 4 moreover, l. have only shown two levers in place though the brackets are shown. These levers L are approximately bell-crank in shape and. their arrangement is such that as each hub C C is moved towards or from the pulley it carries the short arms of l the levers with it, thus throwing the long arms of the levers outward towards the periphery of the pulley or inward toward its shaft as the case may be, thus moving the sections K with it. It is evident therefore that as the hub moves, all these levers acting in unison will cause each section K to move the same distance towards the outer edge of the flanges H, J, and hence will give to the belt a proper symmetrical bearing surface. To reduce the diameter of this hearing surface all that is necessary of course is to withdraw the hub again from the pulley, which carries the short arms of the levers with it and hence causes the bearing surface of the pulley to collapse or become smaller.

I prefer as a matter of construction that the flange J should have integral with it a sleeve J on which the flange H shall be driven, or to which it shall be otherwise attached after the sections K are in place.

Referring now to Fig. 2, it will be noted that various adjustments of these parts can be had. By moving the shipper G the posi tion of the lever E will be changed, thus increasing the size of one pulley and decreasing rection in which the shipper G is moved.

The means for compensating the belt above referred to, viz: the change in the position of the blockf, may be thus explained: If it is sup osed that the lever E is in a line at right ang es to the axes of the shafts D, D and the belt is slightly loose, it will be noted that by the size of the other, depending upon the diturning the screw f so as to push the block f y in the direction towards the arrow in Fig. 2, both hubs C 0 will be pushed an equal dis tance slightly inward towards the flanges H of the two expanding pulleys and this will cause a slight increase in the diameter of the pulleys suficient belt. This increase will be the same in both pulleys. This having been accomplished, the apparatus is then in condition for use and may be adjusted according to the variations in speed required or desired. 1 do not mean to iinit myself, however, to this exact arrangement between the two pulleys as the same results may be accomplished otherwise. It will be noted that supposing the diameter of the two pulleys, the one expanded the other contracted, to be as 2 to 1,. by revers ing the position of the two hubs the ratio will to take up any slack in the be reversed and become as 1 to 2. It will also be noted that by placing two of these pulleys upon the same countershaft, power taken from a similar pulley on the main shaft may be multiplied or divided as occasion may require.

I do not limit myself to the exact construotion of expanding pulley shown herein, although I believe that to embody my invention in its best form, for the reason that a positive movement is given to the expanding sections of the pulley both while expanding and contracting, and a given movement 0 the levers in either direction must always produce the same corresponding movement of the expanding sections, which is not al ways the case where a cam movement is provided for this purpose.

What I claim as my invention is 1. An expansible pulley comprising two flanges, sections ada ted to be moved radi ally between said fl anges, and means for moving said sections comprising a shaft, a hub slidable on said shaft, a series of levers each fulcrumed on one of said flanges and a series of links each connecting one of said levers with one of said sections as described.

2. An expansible pulley comprising two flanges, sections ada ted to be moved radially between said anges, and means for moving said sections comprising a series of levers and means for moving them, and means for su porting said levers comprising a series of s otted brackets, pins passing through the fulcrums of said levers and a series of clamps resting upon said pins and attached to said brackets as described.

3. An expansible pulley comprising two flanges, sections adapted to be moved radially between said flanges, and means for moving said sections comprising a series of levers and means for moving them, each section having approaching walls forming jaws and a link pivoted between said jaws, its other end being pivotally connected to one of said levers as set fort 4. An expansible ulley comprising expansible sections an means whereby they may be expanded, comprising a hub adapted to slide on a shaft, a series of angle levers ful crumed on said pulley, one end of each of said levers being adapted to slide in said hub at right angles to its axis, and the other being connected to one of said expansible sections, as described.

JAMES E. TUTTLE.

\Vitnesses:

GEORGE O. G. CoALE, MARTIN V. FOLEY. 

